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Hi to all you mad scientists..
I built a new setup, with a big blue tupperware and a cool mist umidifier as the scheme shows...

So my problem is that the %rh is always over 90-92, also if i leave the 2 exausts valves totally opened...
maybe good for cubies but i want to grow also mexicana and panaeolus species....
any advice to lower the umidity??? maybe another valve placed on the cool mist exaust??

Increase the flow rate of the humidifier...if its already on high, consider adding an inline variable computer fan to the setup to regulate flow rate. Higher air flow = lower humidity. Is the box the correct dimensions to achieve the entrainment effect? Please share them, if you've done the calculations. Gee I wish mcman were here, he'd have loads of help for you.

no, i didn't drill any exaust holes in the chamber...are necessary??? (probably yes)
btw...the tube that bring umidity into the chamber is 23mm (3/4 inch) diameter, i drilled 9 holes of 4.6 mm diam, so more or less the total area is the same as the main tube....
and thanks for hear my pray mcman:)

i'll drill the exaust hole this evening and post results tomorrow....
i added some colloidal silver to the water in the humidifier, but just to begin sterilize a bit the hudifier itself, the ducts and the chamber
once the system works properly i'll switch to peroxide....

In reply to:

once you have the exhaust hole drilled in place, you should keep both of the caps on the ducting to decrease the humidity for the fruiting cycle, and pull the top vertical cap off for the pinning cycle for the higher humidity

i'm sorry i don't understand this. You mean that i should completely open the valve of the duct that carry the air into the chamber to decrease the rh level and close the vertical valve to increase rh for pinning?? is exactly wah i'm doing if is the case
probably i should post a pic where is shown the way i did the valves btw....

damn....closing both valves raises the rh up to 98%, also with the exaust hole in few minutes...
mmm looks like the umidifier is too potent for the terrarium, so potent that i saw fog inside the terrarium when i lifted the cover...
i'll try to change the duct to a 1", but i'm not so sure that this will fix the problem....
maybe using a longer duct from the umidifier to the terrarium helps for the condensation.
do you think a dimmer can help? at least to let the humidifier go at half speed or so....

i'm using the Kaz HealthMist? 4100
the length of the duct is less than one meter....i didn't measured it but is something like 80 cm, right now i didn't add perlite and there's positive pressure coming out from the exaust hole

well, after changin the duct to a longer one, the thinghs are going better, with both valves open i got 87% rh, now i closed the vertical one and is going up to 90% after 1/2 hr...
more updates later.....